In what ratio must a person mix three kinds of dall costing him Rs 12.25,Rs 12.50 and Rs 12.75 per Kg so that the mixture may be worth Rs 12.65 per Kg? a) 11:7:1 b) 22:3:6 c) 14:3:4 d) 2:7:4 e) 3:12:32
E
Step1: Mix dall of first and third kind to get a mixture worth Rs 12.25 per Kg.
C.P of 1 Kg dall of 1st kind 1225p
C.P of 1 Kg dall of 3rd kind 1275p
So they must be mixed in the ratio 1 : 4
Step 2: similarly Mix dall of 1st kind and 2nd kind to obtain a mixture worth of Rs.12.65per Kg
So the Mixed ratio = 3:8
Thus the quantities of dall 1st : 2nd : 3rd
= 3:12:32